Locking-latch for doors



UNITED STATES PATENT OFFICE.

EDMUND FIELD, OF GREENWICH, CONNECTICUT.

LOCKING-LATCH FOR DOORS.

Specicaton of Letters Patent No. 13,163-, dated July 3, 1855.

To all whom t may concern:

Be it known that I, EDMUND FIELD, of Greenwich, in the county ofFairfield and State of Connecticut, have invented a new and ImprovedLock for Sliding Doors; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe annexed drawings, making a part of this specification, in which-Figure 1, is a view of the interior of my improved lock, t-he side ofthe casing nearest the eye being removed, and showing the lock in anunlocked state. Fig. 2, is the same view as Fig. 1, with the exceptionthat the parts are shown in two different positions.

Similar letters of reference indicate corresponding parts in the twofigures.

To enable`others skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A represents the casing of the lock, which may be of rectangular form,and B is a sliding bolt which works on a stump (a) said stump passingthrough a slot (o) in the bolt. Between the bolt B and the casing thereis a guard tumbler C, shown by dotted lines in both figures. One end ofthis guard tumbler works on the stump (a), and the opposite end isprovided with a projection (c) against the back side of which a pin (d)on the bolt catches when the bolt is thrown forward as will be hereaftershown.

D is a spring which acts upon the bolt, and E is a spring which actsupon the guard tumbler.

Just below the bolt B there is a catch F the inner end of which works ona pivot (e). The outer end of the catch passes through a slot or opening(f) in the front of the casing A, said slot being suiiciently long toallow the outer end of the bolt B to pass through.

To one side of the framing of the door there is secured a slotted bar G,and a mortise (g) is made in the framing over which the bar G issecured, the lower edge of the slot in the bar G being some distanceabove the lower edge of the mortise (g).

)When the door is closed the lower or inclined edge at the outer end ofthe catch strikes against the lower edge of the slot in the bar G andthe catch passes through the slot and is forced down over the lower edgeof said slot by the spring D which acts both upon the bolt and catch.The key is then inserted in the key hole and turned, and the guardtumbler C is first raised so that the projection (c) will be raised fromthe pin (d) attached to the bolt. The key then throws the outer end ofthe bolt through the slot in the bar G and the catch is therebyprevented from being raised until the bar is thrown back.

The catch F is operated by a knob in the usual manner. The red linesFig. 2, show the position of the parts when the lock is in a lockedstate.

Now, by this relative arrangement of the locking bolt and catch (F),both hung and operating as specified, it will be perceived that slidingbolt (B), when shot forward, does not simply serve to lock the catch (F)to or in its closed position, but to make the catch as well as thesliding bolt a locking bar to unite the door to its fixed frame, thebetter to resist violence in attempting to burst o-pen the door, and, asthe sliding bolt (B), when locked, stops the race or play aperture ofthe catch, the catch is more securely protected from being picked andthe interior of the lock from receiving dust or dirt, while, it shouldbe observed, from the description here given of the manner in which theparts are arranged and operate, that when the sliding bolt (B) is in itsunlocked position, both it and the tumbler guard (C) are raised andlowered or set in motion, without producing any locking action, everytime the catch is operated to fasten or unfasten the door, which actionor effect of the catch upon the bolt and its tumbler guard willelfectually serve to prevent the locking bolt and tumbler guard adheringto each other or the lock casing by rust, or sticking, and will keepthem in a free and smoothly operative condition even though the lockingbolt (B) may not be used for a lengthened period to secure the doorwhich in a general way may be fastened simply by the catch, and thus thesticking of the bolt and locking parts that so commonly occurs where thebolt has stood idle for a lengthened period frequently causing breakageof the key when inserted for the first time afterward to shoot the bolt,is avoided; and all the operative parts connected with the bolt, itstumbler guard, spring et cetera are kept in perfect action by the playof the catch.

I claiin nothing neW in the looking bolt or catch separately Considerednor yet in and so that the locking-bolt With its tumbler guard and otherappurtenance or appurtenances, when not being used to look the door, areset in motion by the oateh each time it is operated, substantially asand for the purposes Set forth.

EDMUND FIELD.

Vitnesses:

RICHARD B. CARPENTER. ISAAC O. CLOSE.

